Manual

Beginning Programming 6-19
Dot Parameters
You can control the size and accuracy of dot dispensing by experimenting with dot parameters. You can
also change Dispensing Head behavior and valve time to ensure clean dispensing. The Dot Parameters
are divided into four categories according to when each parameter is implemented during the dispensing
process. The categories are:
Pre-Dispense
During Dispense,
Post Dispense
Advanced
You may define up to ten different dot styles in FmNT. Each style may have different parameters.
Pre-Dispense Dot Parameters
Settling Time
This is the length of time that the Dispensing Head will park over the dispensing location before
beginning to dispense. The Settling Time is set to 0, except in special circumstances. For more
information, contact Asymtek Application Engineering.
Down Speed
The Down Speed is how fast the Dispensing Head lowers to dispense. Low viscosity fluids tend to drip
and you may want to set this parameter to a high value. The higher the value, the faster the Dispensing
Head will move. Height sense accuracy is dependent on Down Speed and Down Acceleration. The units
are inches/second. Typically, 2 in/sec is the default setting. Refer to the manual for your particular
dispensing system for information on your Height Sensor.
Down Acceleration
This parameter controls how fast the Dispensing Head accelerates to the Down Speed. The higher the
value, the faster the Dispensing Head will move. The units are in inches/second squared. Typically, 300
in/sec
2
is the default setting.
During-Dispense Dot Parameters
Valve-On Time
This parameter controls the time the valve is on while positioned over the dispensing location. The time
interval affects dot size. The longer the Valve-On Time, the larger the dot. The units are in seconds. The
typical value is 30 milliseconds, however, the Valve-On Time can be as long as 6 seconds, depending on
the desired dot size and fluid properties.